Please help to choose books

Hello everybody. We need to decide which books to choose for our bilingual school (inicial, primary and secondary levels). There are two options. Oxford publisher (kind of Headway) and Richmond's Achiever. Please who knows what works better, could you share you ideas/opinions? The problem is that I am responsible for it, but have no idea what is really better. Thank you.

I've used Headway before for several years... one of the better EFL textbook series I've encountered. They require a lot of supplementation by teachers, but the students find them accessible and interesting.

I've used Headway before for several years... one of the better EFL textbook series I've encountered. They require a lot of supplementation by teachers, but the students find them accessible and interesting.